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No. 357,001. Patented Feb. 1, 1887.

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MACHINE POR ROLLING SGRBWS.

Patented Feb'. 1, 1887.

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Patented Feb. l', 1887.

M AGHINE FOR ROLLING SCRBWS.

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No.357,001.A

Xsmw" .29. if@ mw i UNITED STATES PATENT EFICE.

HAYWARD A. HARVEY, or ORANGE, NEW JERSEY;y

MACHINE FOR RoLLlNG sclfuaws.v

SPECIFICATION forming part of Letters Patent No. 357,001, dated February1I 1887.i

f 5 Application filed September 14, 1886. Serial No. 213.486. (Nomodel.)

To llewzom it may concern.-

Be it knpwn that I, HAYwARD A. HARVEY, of Orange, New Jersey, haveinvented certain Improvements in Machines for Rolling the Threads onScrews and Bolts, of which the following is a specification,

These improvements relate to the type of machines for forming thethreads of screws and bolts in which the blank Iisrolled between twoflat dies, the faces of which are provided with series of parallelribswhich are linclined in relatively opposite directions; and the chieffeature of the invention consists in means for giving to oneof thesedies several to-and-'fro endwise movements while the other die is makinga single endwise movement, and in means for, at ythe same time,gradually narrowing the space between the two dies,whereby the thread isimpressed upon the body of a screw-blank during a prescribed number offorward and backward movements, the blank being fed into the spacebetween the dies at one end of the slow-moving die, then rolled back andfortha prescribed number of times along the face of u the slow-movingdie, and finally discharged,

after the thread is formed, by being rolled off from the end of theslow-moving die opposite that to which it was fed.

The invention also embraces certain details in the organization of themachine and some especial features of.the mechanismfor feeding in thescrew-blanks.

The accompanying drawings of a machine containing the improvements areas follows: Figure l is atop view. Fig. 2 is a longitudinal vertical-section taken through the offset dotted line a: x on Fig. l. Fig. 3 isatransverse vertical section taken through the dotted line y y on Fig. l.Fig. t is a side View of the cams. Fig; 5 is a top view of the dies,illustrating their relative positions when in the act of seizing a blankat the commencement of the rolling operation. Fig. 6 is atransverseverticalv section taken through the dotted line zz on Fig. 5,and also showing in elevation the ways and al blank which has just beenseized by the dies. Fig. 7 is a top view of the portion of the machinein which the dies are supported; and Fig. 8 is a vertical section takenthrough the line w w on Fig. 7, showing. the die f and the dividing-ngerFa in their `extreme forward position.

The machine illustrated in thedrawings is erected upon a substantialhorizontal frame, A, provided with legs at its corners, by means ofwhich it is supported upon and secured to the bench upon which themachine is placed. The driving-shaft B is horizontal, and has itsbearings, respectively, in the box B upon the top of the side member Aof the frame and in the box B2 on the top of the standard a', cast uponor affixed to the horizontal bed or table a.

The driving-pulley B3 is affixed to the projectng outer end, B4, of thedriving-shaft B.- At its'inner end the driving-shaft is provided withthe crank B5, from which reciprocating motion is imparted, by means ofthe pitman C, to the carriage C', providedon itsfunder side with thetongue C2, seated in the horizontal groove G3, formed in the bed a. Theearriage C' is held down in its place by means of the cap Ci, bolted tothe top of. the side member A2 of the frame. The carriage C carries thedie D, the iiat vertical face of which is provided with a system ofparallel inclinedribs, d.

The part of the bed a adjoining the side member A2 of the frame issuitably slotted' to allow the necessary clearance for the moving partsofthe machine. r

A spur-wheel, b, affixed to the driving-shaft B 'engages they pinion b',afxed to the hori-` zontal camshaft E, having its bearings,respectively, in the box E on the top of the side member 4A of the frame'and in the box E2 upon the top of the standard c2, cast upon or affixedto the bed a. Upon its inner end the cam-shaft E is provided with a cam,e, acting upon a roller, e', mounted upon a cam-pin inserted in the arme2, which is connected with the carriage F, carrying the die f, which isprovided uponits face with a series of parallel inclined ribs, f. Thecarriage F is provided upon its under side with a tongue, F', which isslightly diagonal with relation to the face of the dief, and which isseated in a correspondingly diagonal groove, g, formed in the top of thehorizontal plate G, which is supported upon the bed c, and is madeadjustable thereon toward and from the side member A2 of `the frame bymeans of the horizontal adjusting-bolts H and H', inserted horizontallythrough the side member Ay of the frameand into the plate G. A

The plate G is rigidly secured in the position to which it may have beenadjusted by means of the jam-screws h 1i', which are provided with largecollars and inserted through holes in the plateG into the bed c, theholes in the plate G being made large enough to permit the requiredrange of adj ustable movement of the plate G.

The vertical side F2 of the carriage F is also diagonal relatively tothe face ofthe die f, as shown, and may be provided with acorrespondingly diagonal bearing, along which it can slide; or, as shownin the drawings, it may have a bearing against a series of anti-frictionrollers, z', cc., rotating in vertical bearings formed, respectively, inthe plate G and in the cap G, bolted to the top of the rib G2, which iseastin one piece with or affixed to the plate G. The cap G extends overthe top of the carriage F and holds it down in its seat.

lilie movement of the carriage F toward the driving-shaft, which forconvenience may be called its forward movement,77 is effected by therotation of the cam e. its return move ment is effected by therctraeting spiral spring J, connected at one end to the hook J on thelower end of the vertical arm J2, inserted in the under side of thecarriage F, and eXtending downward therefrom through a suitable slot inthe bed a. The opposite end of the spring J is connected to the frame.

The limit of the backward movement of the carriage Fis adjustablyregulated by means of the abutmentscrew J, inserted horizontally throughthe end membenAs, of the frame, against the end of which the carriage Fstrikes at the termination of its backward movement.

It will be seen that the dief, carried by the carriage F, makes oneforward excursion during each revolution of the camshaft E, and at theend of its forward excursion is instantly retracted to its formerposition by the backward pull ofthe spring J, and that while making itsforward excursion the face of the die f, by reason of the diagonalbearing afforded for the diagonal side F2 of the carriage F, moves inaslightly diagonal direction, and thus gradually approaches the plane inwhich the die D reciprocates; and it will also be seen that thedriving-shaft B is so geared to the cam-shaft E as to make severalrevolutions while the camshaft is making one revolution, and that ateach revolution of the drivingshaft B there is imparted from it, bymeans of its crank Bs and the pitman C, a forward and backward movementto the carriage C, carrying the die D.

The driving-shaft and camshaft are to be so geared together as to impartto the die D any required number of forward and backward movements whilethe diefis making one forward and backward movement. Bythe use of thegearing shown in the drawings, the die D makes three forward andbackward movements while the diefis making one.

For convenience of adjusting the range of movement yof the carriage C,carrying the die D, the crank B5 is provided with a radial slot for thereception of the crank-pin B, which engages the forward end of the linkC. The crank-pin is provided with a suitable shoulder, and is secured inthe position to which it may have been adjusted by means of the jamnutB7,

Various kinds of feeding mechanism may be employed for feeding theblanks to the machine. That shown in the drawings consists oftheinclined ways K, down which the blanks, hanging by their heads, slideby their own gravity to the horizontal part K of the ways, which, aswill be seen, bends to a right angle and is in alignment with the spacebetween the faces ofthe two dies.

As a measure of precaution, although it will not in all cases benecessary, the forward end of the carriage Fis provided with thedividing-linger F, the point of which, just before the carriage Fcompletes its forward move' ment, enters the space between the lowermostblank of the row of blanks in the ways and the blank behind it, andseparates the lowermost blank from the blank behind it, and insures itspassage from tlielower end of the inclined portion of the ways to theforward end of the horizontal portion of the ways, where it is inposition to-be transferred to the delivery end K2 of the ways. Thistransfer is effeeted by means of the sliding transferrer L, providedwith a cam-pin, L', which is engaged by the cam l, mounted on thecamshaft E.

The transferrer is a horizontallysliding plate provided with suitablebearings and slid- Aing in a path parallel with and adjoining the planein which the face of the die D reciprocates. By the rotation of the camZ the trans ferrer is drawn forward a little in advance of the forwardmovement of the carriage F, in order to afford time for the lowermostblank in the ways to reach the horizontal part of the ways in front ofthe end L'2 of the transferrer.

The transferring movement of the transferrer is effected by theretracting-spring M, one end of which is secured to a hook, m, insertedin the under side of the bed a, and the other end to the hook m on thelower end of the arm L, projecting downward from the transferrer L.

The limit of the backward movement of the transferrer L is determined bythe abutting against a shoulder forming a portion of the bed a of theadj listing-screw M', inserted transversely through the arm L.

The timing of the moving parts is such that when the die D makes itsfirst backward move` ment after the die f has completed its back wardmovement it finds a blank, N, in the position in which it is representedin dotted lines in Fig. 1. The result is, that the shank of the blank iscaught between the back end ofthe face of the die D and the forward endof the face of the dief, as shown in Fig. 5, and, by the backwardmovement of the die D, is rolled backward a prescribed distance alongthe face of the die f. The return move IOO IIO

ment of the die D fons the blank forward along rolled backward andforward along the face of the dief, until finally, at the end of thethird backward movement ofthe die` D, when the screw-thread has beencompletely formed, the die f has moved so far forward that` theiinished'screw is rolled off the back end of the die f and drops throughan opening in the bed c to the bench below, or to a receptacle placed toreceive it. During these backward and forward movements of the -die D,while the die f has been making its forward movement, the face of thedief has been gradually approaching the plane in which the face of thedie D moves, and hence, during both the 'backward and the forward.rolling movements of the blank upon the face of the die f, theoppositely-inclined ribs upon the faces of the two dies have beengradually pressing deeper and deeper into the surface of the shank ofthe blank by reason of the steady approach of the blank, until finally aspiral thread has been formed thereon of the desired depth and of ashape corresponding in cross-section to the cross-section of the spacesbetween the ribs of the dies.

'It will be seen'that both the backward and ,y

the forward movements of the die D are renderd effective in impressingthethread upon the dief toward the plane in which the dieD reciprocates,and it will also be seen that the slow movement of the die f in onedirection during the reciprocating movements of the die D, allowing theblank to be fed against the forward end of the die f, and to be rolledback and forth along the face of the die f, and to be finally dischargedfrom the end of the die f opposite to that to which itwas fed, permitsthe employment of comparatively short dies, which are inexpensivein-their construction and easily replaced when worn.

What is claimed as the invention-is# l; In a machine for rollingscrew-threads, the combination, substantially as herein. set forth, "oftwo reciprocating dies havingtheir opposed faces suitably ribbed, meansfor giving to one of said dies a prescribed range of slow endwisemovement in one direction, and means for giving in the-same time to theother of the said dies two or more relatively rapid reciprocatingmovements, for the purpose of rolling a screw-thread upon the body of ablank. introduced into the space between the two dies.

2. In a machine for rolling screw-threads, the combination,substantially as herein set forth, of two reciprocating dies havingtheir opposed faces suitably ribbed, means for guidgradually diminishes.

`ing the movements of said dies in planes slightly diagonal to eachother, means for giving to one of said dies a prescribed range of slowendwise movement in one direction, 7o

means for giving in the same time to the other of the said dies' two ormore relatively rapid reciprocating movements, and means for feedingscrew-blanks into the space Ibetween the two dies,.whereby spiralgrooves are impressed in the body of the blank and gradually deepenedduring the backward and forward movementsof the quick-moving die as thewidth of the space between the faces of the two dies 3. The combination,substantially as and for the purposes set forth, of the reciprocatingdie D, means for guiding and means for imparting a prescribed range ofreciprocating motion to the die block or carriage carrying the die D,the dief, the carriage F, means for guiding the movement of the carriageF in a path slightly diagonal to the face of the dief, means forimparting aslow forward movement to the carriage F and means forimparting a quick backward movement thereto, and the adjustableabutment-screw J, for limiting the range of backward movement of thecarriage F. f

4. In combination with the reciprocating dies D andf, theadjusting-plate G, for regulating relatively to the plane of motion ofthe die D the position of the diagonal guide for the carriage F,carrying the dief.

5. The combination, substantially as and for the purposes set forth, ofthe reciprocating die D, the carriage F, carrying the dief, the cam e,the arm e2, engaging the cam e and conneet-ed with the carriage F,andthe retractingspring J.

6. The combination, substantially as set forth, ofthe reciprocatingdieff' the dieD, the

carriage C', the pitman C, the radially-slotted crank-arm B5, and theadjustable crank-pin B.

7. The combination, substantially as set forth, of the reciprocatingdies D and f, the transferrer L, the ways K', for `supporting ascrew-blank in front of the end of the transferrer and in alignmentwiththe space between the faces of the dies, and means for at the propertime imparting endwise movement to the transferrer in a path parallel ornearly parallel to the planeof movement of the dies, for the purpose oftransferring the blank sidewise to the delivery end K2 of the ways K andpresenting it in position to be caught between the corners ofthe diesand rolled into Vthe space between the dies.

8. The combination, substantially as and for the purposes set forth, ofthe reciprocating die's D andf, the inclined ways K, the hori- IOO IIO

